`odisabled` will still return for a formula in `.brew`. This means
`EOS.undent` returns `nil` and the formula cannot be parsed. Instead
return the actual string in this case to avoid e.g. patches blowing up
with `nil` strings.

Fixes #4049.

* specify repository location using `-C` option
* change `newest` to `latest` when talking about the latest tagged
commit

The order of the regexes in `Keg#replace_text_in_files` matters.
Otherwise, `/usr/local/Cellar` will be replaced to
`@@HOMEBREW_PREFIX@@/Cellar` instead of `@@HOMEBREW_CELLAR@@`.

Fixes Homebrew/homebrew-core#26043.

If --or-later is passed, append _or_later to the bottle tag.

This reverses the previous, incorrect order.

This method was missed in #3896.

As reported https://github.com/Homebrew/brew/pull/4037#issuecomment-379591755.

Undefine `tap` to allow `--tap` arguments to work as expected.

Fixes #4030.

Move various `odeprecated` to `odisabled` and delete uses of
`odisabled`.

These don't behave as expected; depending on when and where in Homebrew
(or even an installation process) these are evaluated they return
different results. This means that sometimes these will be seen as
dependencies and sometimes they will be ignored entirely by the DSL.

Instead `:optional` or `:recommended` dependencies should be used. We
don't have a solution yet for grouping dependencies together but this is
another case for removing more optional dependencies altogether (as
there are no designs or proposed implementations).

Fix various circular requirements, method redefinitions, etc.

Address the confusion in #4015.

After all these formulae have been deleted we want to warn people on
tapping it.

A bunch of these were needed before superenv, environment filtering or
on now long-unsupported versions of macOS.